Slider for separable fasteners



Sept. 18, 1951 L. H. MORIN SLIDER FOR SEPARABLE FASTENERS Filed 001:.11, 1946 INVENTOR 100/5 6 Maw/v WW ATTORNEY Patented Sept. 18, 1951-UNITED STATES. PATENT OFFICE 2,568,163 SLIDER FOR SEPARABLE FASTENERSLouis B. Morin, Bronx, N. Y.

Application October 11, 1946, Serial No. 102,600

Claims. (01. 24-20515) This invention relates to sliders for use incoupling and uncoupling stringers of separable fasteners. Moreparticularly, the invention deals with a die cast slider so formed as toproduce a flared entrance for each stringer to the channel of the sliderbody to insure positive and free coupling engagement of the scoops onewith the other and to materially ease movement of the slider along thestringers, particularly in the operation of coupling the stringerstogether. The novel features of the invention will be best understoodfrom the following descriptions when taken together with theaccompanying drawing in which certain embodiments of the invention aredisclosed, and in which the separate parts are designated by suitablereference characters in each of the views; and in which:

Fig. 1 is a perspective sectional view of the inner surface of one wallportion of a slider made according to my invention.

Fig. 2 is a side view of a slider showing the entrance opening at oneside of the slider body; and

Fig. 3 is a diagrammatic view showing the cores in exploded relationshipto each other and with respect to a slider formed thereby, the latterbeing shown in section.

In sliders of the type and kind under consideration, it has beencustomary to form the walls of the slider body, or inner surfacesthereof substantially parallel with respect to each other, except forrounded corners at extremities of said walls. To insure reasonably freeentrance of the stringer scoops into the channels of the slider betweensaid walls, it has been essential to sufiiciently space the walls toaccomplish this result without undue binding upon the stringer scoops.When the stringers are arranged in an irregular or wave-like fashion,difliculty has been experienced in freely operating the sliders alongthe stringers, particularly in coupling the same, the scoops tending tojam on the walls of the slider, blocking free action.

It is the purpose of my invention to so construct the walls of a slider,primarily the inner surfaces of the walls at the entrance openings, to,provide free entrance of the scoops of each "stringer, while at the sametime, bringing the scoops into an alinement, insuring proper mesh orengagement of the scoops one with respect to the other, particularlywhen interlocking ele- "ments of the scoops require reasonably closealinement for proper coupling engagement. Still further one of thefeatures of my invention resides in shortening the inturned flanges ofthe slider walls or the length of the resulting channel defined by suchflanges, and to proportionately lengthen what is generally termed thedouble channel end of the slider, so as to reduce the over-all width ofthe slider, and at the same time, form a dart-like end defined bymerging convexly concaved edges to the upper and lower walls of theslider, as most clearly illustrated in Fig. 3 of the drawing.

Considering now Fig. 2 of the drawing, here is shown a side view of aslider made according to my invention, the slider having a top wall l0,bottom wall ll, said walls at the contracted end thereof havingrelatively short inwardly extending flanges l2 and I3 defining thechannel end ll of the slider, which controls coupling engagement betweenthe scoops of opposed stringers. The stringers are not shown, as in thisart, the fastener devices are well known and need no illustration.

The walls Ill and l I are joined at the other end of the slider by aconnecting web I5 which is more or less of conventional cross sectionalform. as clearly seen in Figs. 1 and 3. However, the outer rounded endportion l6 of the web is arranged in alinement with the convergingconvexly curved edges ll of the walls of the slider, for example, thewall H, as shown in Fig. 3, in forming a more or less dart shaped end tothe slider body. The curved edges l1 unite or intersect at the outer endof the web I5 and conform to the round contour of the outer end of saidweb, as will readily appear from a consideration of Figs. 1 and 3 of thedrawing. The walls l0 and ii substantially in longitudinal alinementwith the web i5 have flat inner surfaces l8 which extend to the fullwidth of the channel M, as indicated at H. It will be understood thatthe construction of both walls i0 and I l is the same, thus the briefdescription as applied to one wall, will apply to the other wall.

Beyond the flat parallel surfaces IB-i9, the walls l0 and I l taper inthe direction of the edges l1 and the flanges i3, as indicated by thebevelled shaded sections 2020 at opposed sides of the slider andbordering the entrance opening 2 l2 i between the web i5 and the flangesl3. The taper of the portions 20-20 becomes steeper or more abrupt atits approaches the web, as indicated by the heavier shading at 22-22 onthe wall i I and also by the shading 23', as appearing on the wall l0 inFig. 2 of the drawing. In other words, the pitch or slope of eachopening 2I-2l' is greatest adjacent and at opposite sides of the web l5and gradually decreases in the direction of the flanges l3. It has beenfound that, by so forming and correlating the slopes of the sliderassesses surfaces, scoops which otherwise tend to jam' and fail to enterthe slider as the result of approaching it from the side rather than indirect alinement with the openings, are caused to rotate into alinementand to enter the respective openings smoothly and in position withrespect to each other to insure free and easy coupling engagement. Inthis respect, the tolerances of the surfaces It may be more closelymaintained than was heretofore possible with the adjacent inner surfacesof conventional sliders. In other words, the space or distance betweenthe flat surfaces Hi can be reduced to fit the scoops more closely. Itwill also be understood that the flared wall portions provide a free andeasy entrance of the scoops through the entrance openings 2 l-2 I intothe single channel portion of the slider.

In forming the slider, as a die cast member. the same is formed betweena pair of dies employing core members, such as diagrammatically shown at26 and 25, the core member 2% comprising a pair of fingers 26 shaped toform the bevelled or flared surfaces 20-20' and 2222', as well as thesurfaces 23', one of which is shown in Fig. 2. The members 26 are spacedapart by the opening 2?, the base of the opening having a curvature, asat 28 forming the curved or rounded surface it of the web l5 and havingslight shoulder portions, as at 29, at the greatest diameter of thecurvature l6 so as to provide free pulling of the core 25. The othercore 25 is in the form of a bar having an inner V-end 30 forming theinner V-shaped contour 3| of the web l5 and the arms defining the V 30have chamfered ends 32 which fit in the shoulders 29, the core 25forming the flat opposed surfaces l 8 on the slider walls It and H, aswill be apparent. The base or outer end of the core 25 is enlarged, asseen at 33, to form the wide surface l9, as will be apparent.

By reason of the tapers 20-20, which extend to the full width flatsurfaces I 9 on the slider walls, the flanges l2l3 will have a greaterdepth at their inner ends than at their outer ends. This is clearlyindicated by the dotted lines 34- 35, as seen in Fig. 2 of the drawing,which indicates the extension of the curved or flared surfaces 20-20',and these curved lines are also indicated by the reference character 35upon the slider wall H, as seen in Fig. 1 of the drawing. It will alsobe apparent that the curvatures of the flared surfaces 2020' and 2222are such as to provide free Pulling of the core 24 after the casting hasbeen formed. Sliders may be cast in suitable metal or in plasticmaterials. It will be apparent that the particular structure of theslider aside from the walls defined by the cores may be modified to suitdifierent uses. In the present disclosure the dies, not shown, arefashioned to form on the top wall I0 an elongated loop 35 for attachmentof a suitable pull.

It will be apparent that the bevelled or flared surfaces 20-20 and 2222,including corresponding surfaces of the opposed slider wall blend intothe flat surfaces l8 and I9, and the bevel or flare produces entranceopenings or throats at the sides of the slider body which have theirgreatest width at the curved edges l1. It will also appear that theentrance openings are substantially equal in length to the length of theflanges 12-13. In other words, the flanges extend longitudinally of theslider a distance substantially equal to one-half of the over-all length.of the slider, distinguishing in this respect from have extendedgreater than one-half the over-all length of the slider. Thesestructural features result in producing a slider of what I term thenon-fouling type, and which will freely guide scoops of stringers intothe slider body and insure proper alinement and coupling at the positiondefined by the substantially parallel flat surfaces IBI9. These surfacesmay define what is termed a restricted passage through the slider body.It will also be understood that my improved slider constructionminimizes the area of surface engagement of the slider with the stringerscoops in minimizing the area of the substantially parallel surfaces l8and 19.

From a description standpoint, my improved slider may be said'to havehopper or funnel like admission openings for guides of the scoops intothe slider body preparatory to coupling or meshing the same.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A slider of the kind consisting of walls united by a web at one endand having flanges extending along side edges of the walls at the otherend thereof, in which: the inner face of each wall is formed with acentral flat portion extending longitudinally from the web to the saidother end of each wall, the said flat portion being bounded on each sideby a bevel surface extending longitudinally from the web to a pointbetween the flanges intermediate the flange ends, and each bevel surfaceextending transversely from the central flat portion to the adjacentedge of each said inner face.

2. A slider of the kind consisting of walls united by a web at one endportion and having flanges extending along side edges of the walls atthe other end portion thereof, in which: the inner face of each wall isformed with a central flat portion extending longitudinally from the webto the said other end portion of each wall, the said flat portion beingbounded on each side by a bevel surface extending longitudinally fromthe web to said other end portion, and each bevel surface extendingtransversely from the central flat portion to the adjacent edge of eachsaid inner face. the pitch of the bevels being steepest adjacent thesides of the web.

3. A slider for separable fastener stringers comprising two walls spacedand joined b a connecting web at the forward end portion of said walls,the back end portion of each wall having opposed curved flanges, thewalls of the slider beyond the flanges having convexly curved edgeswhich intersect at said web, inner surfaces of the slider walls from theweb to the back end portion of said walls having flat and substantiallyparallel sections of a width substantially coextensive with the greatestwidth of the web, said slider walls also having inner surfaces at eachside of said flat surfaces which flare outwardly to said convexly curvededges of the slider walls, and said section of each wall being separatedfrom the forward portion of the flanges of the wall by said flaringsurfaces.

4. A slider for separable fastener stringers consisting of a pair ofspaced upper and lower walls united at their forward ends by a web, eachwall at the rear portion thereof having a flange at each side edge, eachsaid flange extending from the rear end of the wall forwardly asubstantial distance thus forming a pair of stringer-receiving channelsone on each side of the web, the upp r and lower walls of each channelhaving inner opposed sunaces which slope towards each other, saidsloping of the surfaces occurring at the channel entrance and continuinginto the channel for a substantial distance transversely thereof withthe slope being steepest at and adjacent the said entrance, said slopingextending longitudinally of the channel to a point beyond the adjacentends of the channel flanges, and each wall on its said inner surfacehaving a central longitudinally extending flat portion which is spacedfrom said flanges and which intersects the sloping surfaces on each sideof the web.

5. A slider for separable fastener stringers consisting of a pair ofspaced upper and lower walls united at their forward ends by a web, eachwall at the rear portion thereof having a flange at each side edge, eachsaid flange extending from the rear end of the wall forwardly asubstantial distance thus forming a pair of stringer-receivlng channelsone on each side of the web, said channels having their entrances at theforward end of the slider, said upper and lower walls each 6 having ontheir inner opposed surfaces a central flat portion which extendslongitudinally from the web to the said rear portion of each wall andwhich is spaced from the flanges on each wall throughout a substantialpart of the length of said flanges, said fiat portion being bounded oneach side thereof by a bevelled portion which extends from the fiatportion to the adjacent extremities of the wall including the entrancesto said channels, and the bevel of each bevelled portion being greatestat the said entrances.

LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Ulrich Apr. 27, 1937

